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Additional information
Institute of High Energy Physics, Serpukhov. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 47, No. 2, pp. 184–197, May, 1981.
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Rochev, V.E. Legendre transformations and equations for Green's functions. Theor Math Phys 47, 397–405 (1981). https://doi.org/10.1007/BF01086391
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DOI: https://doi.org/10.1007/BF01086391